Question

Where does the graph of x2 - x - 2 = y cross the x-axis?

Answer 1

when y = 0
x^2 - x - 2 = 0
x^2 +x-2x-2=0
x(x+1)-2(x+1) = 0
(x+1)(x-2)=0
x = ? and x = ?

Answer 2

1 & -2?

Answer 3

when x = 1 (x+1)(x-2) = (1+1)(1-2) = 2(-1) = -2

Answer 4

almost break it up
x+1 = 0 or x-2 = 0

Answer 5

-1&2

Answer 6

notice the only time two things multiplied by each other can = 0 is if one or the other is 0

Answer 7

ok thanks!